Basic Chemical Information:
 | The important "ingredient" in Viagra is "Sildenafil Citrate"- |
chemically this is 1-[[2-(6,7-dihydro-1-methyl-7-oxo-3-propyl-1H-pyrazolo[4,3-d]pyrimidin-5-yl)-4-ethoxyphenyl]sulfonyl]-4-methylpiperazine citrate.
Sildenafil citrtate is a white/off-white crystalline powder
Solubility - 3.5mg/mL
Molecular Mass 666.7 g
The drug is sold as blue diamond shape tablets of 25, 50 and 100 mg for oral administration.
| Apart from sildenafil citrate viagra also contains numerous inactive components: |
microcrystalline cellulose
anhydrous dibasic calcium phosphate
croscarmellose sodium
magnesium stearate
hydroxypropyl methylcellulose
titanium dioxide
lactose
triacetin
FD & C Blue #2aluminum lake 
Chemical Information was obtained from Pfizer. Further details are available at www.pfizer.com